Earlier this year, Intel announced the world’s first “smart t-shirt” and now Ralph Lauren is getting in on the action with a new smart polo shirt. The clothing company unveiled its biometric polo at the U.S. Open today where a handful of ball boys will test out the new technology on the world stage.

“Ralph Lauren continues to be at the cutting edge of fashion and culture,” said marketing chief David Lauren. “Our goal is to create and reflect the ultimate lifestyle, and we believe that a healthy and active life is an essential part of that. Ralph Lauren is excited to help lead the industry in wearable technology in this ever-evolving, modern world.”

The new polo shirt packs sensors to track your vitals including hearth rate and stress level. There’s also a built-in “black box” with an embedded accelerometer, gyroscope and Bluetooth chip for sending the data straight to your smartphone. Ralph Lauren even designed an app for reviewing your performance mid-game.

Ralph Lauren’s smart polo is limited to a few ball boys and tennis pro Marcos Giron for now, but the same technology could hit stores in the near future. The company says it hopes to expand its biometric lineup in the next few months, though there’s still no word on how much this shirt will cost. You can catch the new polo shirts in action at the U.S Open.